What is (1.0x10^-15/4.2x10^-7) expressed in two significant figures?
(1.0/4.2)*(10^-15/10^-7)
= 1.0/4.2 * (10^-15)/10^-7 = 0.2380952380952381 * 10^-8 = 2.380952380952381 * 10^-9
2.4 * 10^-9
